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timer: Add AST2700 IBEX timer support

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Add the driver for the AST2700 Ibex timer, which uses CPU
cycles as the timer count running at 200MHz.

Signed-off-by: Chia-Wei Wang <chiawei_wang@aspeedtech.com>
Reviewed-by: Leo Yu-Chi Liang <ycliang@andestech.com>
This commit is contained in:
Chia-Wei Wang 2024-09-10 17:39:17 +08:00 • committed by Leo Yu-Chi Liang
parent 9efcb10a09
commit 4b0129e810
3 changed files with 52 additions and 0 deletions
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6
drivers/timer/Kconfig
View file

@ -106,6 +106,12 @@ config AST_TIMER
This is mostly because they all share several registers which
makes it difficult to completely separate them.
config AST_IBEX_TIMER
bool "Aspeed ast2700 Ibex timer"
depends on TIMER
help
Select this to enable a timer support for the Ibex RV32-based MCUs in AST2700.
config ATCPIT100_TIMER
bool "ATCPIT100 timer support"
depends on TIMER

1
drivers/timer/Makefile
View file

@ -9,6 +9,7 @@ obj-$(CONFIG_$(SPL_)ANDES_PLMT_TIMER) += andes_plmt_timer.o
obj-$(CONFIG_ARC_TIMER) += arc_timer.o
obj-$(CONFIG_ARM_TWD_TIMER) += arm_twd_timer.o
obj-$(CONFIG_AST_TIMER) += ast_timer.o
obj-$(CONFIG_AST_IBEX_TIMER) += ast_ibex_timer.o
obj-$(CONFIG_ATCPIT100_TIMER) += atcpit100_timer.o
obj-$(CONFIG_$(SPL_)ATMEL_PIT_TIMER) += atmel_pit_timer.o
obj-$(CONFIG_$(SPL_)ATMEL_TCB_TIMER) += atmel_tcb_timer.o

45
drivers/timer/ast_ibex_timer.c Normal file
View file

@ -0,0 +1,45 @@
// SPDX-License-Identifier: GPL-2.0+
/*
* Copyright (c) 2024 Aspeed Technology Inc.
*/
#include <asm/csr.h>
#include <asm/io.h>
#include <dm.h>
#include <errno.h>
#include <timer.h>
#define CSR_MCYCLE 0xb00
#define CSR_MCYCLEH 0xb80
static u64 ast_ibex_timer_get_count(struct udevice *dev)
{
uint32_t cnt_l, cnt_h;
cnt_l = csr_read(CSR_MCYCLE);
cnt_h = csr_read(CSR_MCYCLEH);
return ((uint64_t)cnt_h << 32) | cnt_l;
}
static int ast_ibex_timer_probe(struct udevice *dev)
{
return 0;
}
static const struct timer_ops ast_ibex_timer_ops = {
.get_count = ast_ibex_timer_get_count,
};
static const struct udevice_id ast_ibex_timer_ids[] = {
{ .compatible = "aspeed,ast2700-ibex-timer" },
{ }
};
U_BOOT_DRIVER(ast_ibex_timer) = {
.name = "ast_ibex_timer",
.id = UCLASS_TIMER,
.of_match = ast_ibex_timer_ids,
.probe = ast_ibex_timer_probe,
.ops = &ast_ibex_timer_ops,
};